I can't help with finding someone to help, but I can give you some advice so that you can fix it yourself. It isn't too bad once you have someone explain it to you.
Did you replace your crab with the same size carb? The stock sizes are 12mm and 14mm. You should have 1/12/### or 1/14/### stamped on the old carb. the ### designate which model it is and the 12 or 14 is the size. The aftermarket carbs also come in 15mm.
Also, what is the number stamped on your intake (the part that the carb bolts to)? Is it 12 or 14?
You need to change the jetting in your carburetor. If you kept the size the same, you can use the old jet out of the old carb as long as you clean any gunk out of it first. If you screw off the bowl on the bottom of the old carb, you'll see a brass screw with a hole in the center. That's your jet and it should have a number stamped on the side. That's the jet size. If you changed the carb size, you might need a different size jet depending on what size you went with.